Keeping them in a fry and growout tank together, my flavus and saulosi fry both grow faster than my others do. They were in a tank with rusty and lab fry and the flavus and saulosi were much more aggressive in their feeding style, so they grew faster. They come up to the top at feeding time, even as young fry, while the rusties and labs hung out more toward the bottom.

I've never kept track of the growth rate with them in separate fry tanks. That would be an interesting experiment.

i dont keep mbuna but out of my haps i would say that my nimbochromis grow the fastest out of the fish i have now, what has always made me wonder is why fish from the same brood or fish bought at the same time grow at different rates?